EUSO-TA Y.Kawasaki (RIKEN) 共同利用課題 紫外線撮像望遠鏡によるＴＡサイトでの空気シャワー蛍光の観測 旅費 75 万円 1 / 1 7
The EUSO program Ultra-High Energy cosmic rays from space 1. EUSO-TA: Ground JEM-EUSO detector installed in 2013 at Telescope Array site: currently operational 2. EUSO-BALLOON : 1st balloon flight from Timmins, MINI-EUSO CA (French Space Agency) 400 km Aug 2014; 2nd flight: 2016, NASA Ultra long duration flight: 2017 EUSO-BALLOON 40 km 3. MINI-EUSO (2017): Precursor from International Space Station (ISS: 30kg 2017). Approved by Italian EUSO-TA and Russian Space agencies 4. K-EUSO (2019 JFY): ISS Approved by Russian Space Agency EUSO-TA (2013-) 2 / 1 7
EUSO-TA Installed in 2013 Used in 2014 for Auger/Fast tests First data taking campaign in March 2015 Subsequent: May, sept, oct, nov • Stars: 0.34 deg PSF (work also with Moon) • UV Background • Laser: Mobile, LED CLF of TA • Cosmic ray 3 / 1 7
Location of TA-EUSO CLF (21km) ELS (75m) FD Station 4 / 1 7
Black Rock Mesa FD Station 2013 年 3 月 22 日 5 / 1 7
EUSO-TA campaigns So far EUSO-TA had 5 observation campaigns: Detector installation February/March 2015 Focusing, initial calibration Initial CLF and CSOM laser observations Cosmic ray observations – one UHECR detected May 2015 CLF and CSOM laser observations Flat screen and LED calibration Cosmic ray observations – analysis ongoing September 2015 CLF and CSOM laser observations Cosmic ray observations – analysis ongoing Internal trigger tests on the balloon PDM board – successful triggering October 2015 on laser CLF and CSOM laser observations Cosmic ray observations November 2015 CLF laser observations 6 / 1 7 Next campaign – February 2016?
Central Laser Facility Distance from EUSO-TA: 21 km Energy: ∼ 3-7 mJ (4 mJ ≃ 10 19 . 2 eV) Empirical flat fielding applied – Z scale arbitrary See the talk by Shin Hengsu 7 / 1 7
Laser tests Preliminary Colorado School of Mines’ laser results for three campaigns: We can detect on some frames vertical laser with 1 mJ energy, ∼ 33 km from EUSO-TA We could see some shots from 100 km, but we need to check what was the pointing of the laser (if towards us, than the beam was closer when seen) We could swipe the whole focal surface – additional detector sensitivity tests 8 / 1 7 See talk by Lawrence Wiencke
Stars Stars in EUSO-TA with Hipparchos catalogue superimposed Current superimposing can not be perfect due to very complicated EUSO-TA 9 / 1 7 PDM geometry.
Plane triggers A scheme of triggers caused by a plane during a half hour run of EUSO-TA. 1 0 / 1 7
Meteors 5 candidates so far, but I started to distinguish them from planes last Friday TA triggers (probably) on meteor brightening, or on something else – number of packets with meteors limited All cross >2 ◦ in <1 s (5 mach airplane 100 m above does <1 ◦ in 1 s) 1 1 / 1 7
Clouds Sometimes well visible when flat frame used 1 2 / 1 7 More in the talk by Simon Mackovjak
UHECR, confirmed track Found in some TA UHECR candidate data (preliminary analysis) by Shin Hengsu Preliminary data from TA: E ≃ 10 18 eV Distance: 2.5 km 1 3 / 1 7
UHECR, confirmed track Found in November data last Friday Very preliminary data from TA: E ≃ 10 18 . 36 eV (highly uncertain) Distance: 2.6 km 1 4 / 1 7
UHECR, confirmed track First moving event! (even though only 2 frames) It was first mismached with a “diffused” event (due to time matching problems) Very preliminary data from TA: E ≃ 10 18 . 63 eV (highly uncertain) Distance: 6.7 km 1 5 / 1 7
Next step • Absolute calibration • Long term observation to test the reliability and usability of our system and to observe the cosmic ray air shower. • Test of EUSO-SPB 1 6 / 1 7
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